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Generalized measure of image quality in medical X-ray imaging

a generalized measure and image quality technology, applied in the field of medical x-ray imaging, can solve the problems of poor image resolution, blurring of object image, and high noise level

Inactive Publication Date: 2006-08-17
SIEMENS AG
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Problems solved by technology

On the other hand, image resolutions suffers from a poorly conditioned source.
Duration of the exposure also determines image quality since motion of an object during the exposure results in blurring of the object image if the exposure time is too long.
On the other hand, short pulses or exposure times reduce the motion blurring effect but lead to high noise levels.

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  • Generalized measure of image quality in medical X-ray imaging
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[0025] A method for optimizing a medical projection X-ray imaging device provides a single function, namely the frequency-dependent signal-to-noise ratio SNR which incorporates spatial resolution, contrast and noise. The frequency-dependent signal-to-noise ratio SNR describes the ratio between the signal and noise detected in the X-ray image dependent on two-dimensional spatial frequencies u and v so that SNR=SNR(u,v).

[0026] The calculation of SNR(u,v) utilizes the Fourier transform of the deterministic signal h(x,y) as the value H(u,v) and the noise power spectrum signal NPS(u,v) according to the following formula: SNR⁡(u,v)=H⁡(u,v)NPS⁡(u,v)(1)

[0027] The noise power spectrum is only defined if the underlying signal is spatially invariant. An object of interest which is being imaged by the X-ray, however, absorbs either more or less radiation than the background. As such, the noise power spectrum is different at the location of the object of interest. Assuming that the object of i...

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Abstract

A method for defining image quality characteristics of X-ray based medical projection imaging devices is provided. A spatial frequency-dependent signal-to-noise ratio function includes image quality parameters of spatial resolution, object contrast and noise. The detectability of an object embedded into a defined background, such as a cardiac guide wire in a patient is determined. An X-ray system may be defined and set up for obtaining an optimized image quality to determine the best object detectability for a given patient dose.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates generally to medical X-ray imaging and in particular to a method for determining spatial resolution and noise level in medical projection X-ray imaging. [0003] 2. Description of the Related Art [0004] Projection X-ray imaging is used in a medical setting to image structures within the body of a patient. The medical projection X-ray imaging device must be set up to provide a compromise between spatial resolution and noise level. For example, a large focal spot size guarantees a high quantum flux and thus a reduced noise level. On the other hand, image resolutions suffers from a poorly conditioned source. Duration of the exposure also determines image quality since motion of an object during the exposure results in blurring of the object image if the exposure time is too long. On the other hand, short pulses or exposure times reduce the motion blurring effect but lead to high noise levels...

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06K9/00
CPCA61B5/02007A61B5/7257A61B6/12G06T7/0002A61B6/4291
Inventor BERNHARDT, PHILIPPBATZ, LOTHARRUHRNSCHOPF, ERNST-PETERHOHEISEL, MARTIN
Owner SIEMENS AG
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